JP6419152B2 - Optimized adaptive thresholding for touch sensing - Google Patents

Description

  Aspects of the present disclosure relate to touch devices, and more particularly to a comprehensive framework and techniques for touch sensing.

  Devices such as computing devices, mobile devices, kiosks often use a touch screen interface that allows a user to interact with the device by touch input (eg, touch by a user or an input tool such as a pen). Touch screen devices that use a touch screen interface provide convenience to the user because the user can interact directly with the touch screen. The touch screen device receives touch input and performs various operations based on the touch input. For example, the user may touch an icon displayed on the touch screen to run a software application associated with the icon, or the user may draw a picture by drawing on the touch screen. The user may drag and drop items on the touch screen or may pan the view on the touch screen with two fingers. Accordingly, there is a need for a touch screen device that can accurately analyze touch input on a touch screen in order to accurately perform a desired action. Various factors, such as noise, can affect the performance of the touch screen and can affect the accuracy of operation of the touch screen device. In addition, the touch size between various touch inputs (e.g., touch by a user or input tool such as a pen) can vary greatly depending on the touch input used or how the touch is made (e.g., touch screen A flat-pressed finger on the interface versus a finger touching the touch screen interface a little bit). Existing touch screen interfaces are configured (or adjusted) to detect a specific touch size (e.g., finger touch) and thus from other touch inputs (e.g., input tools such as a pen or stylus) May be rejected as noise rather than a valid touch.

  Accordingly, there is a need for a touch screen device that can adaptively detect and process various touch sizes in order to increase the accuracy of the operation of the touch screen.

  Certain embodiments describe systems and methods for improved touch input recognition at a touch panel interface.

  The systems and methods disclosed herein allow for time multiplexing of touch input determination and processing at a touch screen interface. When scanning a touch panel with a touch screen interface, one or more frames can be dedicated to detecting a touch with a touch input (e.g., a stylus) that produces a first touch size, and one or more The frame may be dedicated to detecting a touch with a touch input (eg, a user's finger) that results in a second touch size. The scan rate and sensitivity used to detect the touch can be adjusted for a frame dedicated to detecting a particular touch size. For example, a frame dedicated to detecting touches with stylus input may be processed with high scan rate and high sensitivity. On the other hand, a frame dedicated to detecting a touch by finger input may be processed with a medium scan rate and medium sensitivity.

  In some embodiments, a method for recognizing touch input for a touch panel includes scanning the touch panel with a first frame that includes at least one touch panel blob that results from a touch on the touch panel. Including. The method also includes scanning the touch panel with a second frame that includes at least one touch panel blob that results from a touch on the touch panel. The method additionally processes the touch panel blob in the first frame based at least in part on the first touch reporting sensitivity and in the second frame based at least in part on the second touch reporting sensitivity. Processing the touch panel blob. The method further includes determining whether there is a valid touch based at least in part on the processing step.

  In some embodiments, the method is based at least in part on scanning the touch panel with a third frame that includes at least one touch panel blob that results from a touch on the touch panel, and the third touch reporting sensitivity. Processing a touch panel blob in the third frame and determining whether there is a valid touch based at least in part on the processing step.

  In some embodiments, processing the touch panel blob in the third frame includes processing the touch panel blob with a false touch rejection size of less than 2 millimeters in diameter and greater than 19 millimeters in diameter.

  In some embodiments, the method includes determining a position of the touch panel blob relative to the touch panel based at least in part on the processing step.

  In some embodiments, the processing step further includes adjusting a scan rate of the touch panel.

  In some embodiments, the processing step further includes filtering and interpolating the touch panel blob.

  In some embodiments, processing the touch panel blob in the first frame includes processing the touch panel blob with a false touch rejection size less than 19 millimeters in diameter.

  In some embodiments, processing the touch panel blob in the second frame includes processing the touch panel blob with a false touch rejection size greater than 2 millimeters in diameter.

  In some embodiments, an apparatus for recognizing touch input for a touch panel includes a touch panel, a memory including touch location logic, and a processor coupled to the touch panel and the memory. The processor scans the touch panel with a first frame that includes at least one touch panel blob that results from a touch on the touch panel when touch location logic is executed, and at least one touch panel that results from the touch on the touch panel Scan the touch panel with a second frame containing blobs, process the touch panel blobs in the first frame based at least in part on the first touch reporting sensitivity, and at least in part based on the second touch reporting sensitivity And processing the touch panel blob in the second frame and operable to determine whether there is a valid touch based at least in part on the processing step.

  In some embodiments, an apparatus for recognizing touch input for a touch panel includes means for scanning the touch panel with a first frame that includes at least one touch panel blob that results from a touch on the touch panel; Means for scanning the touch panel with a second frame including at least one touch panel blob resulting from a touch on the touch panel, and the touch panel blob within the first frame based at least in part on the first touch reporting sensitivity Means for processing the touch panel blob in the second frame based at least in part on the second touch reporting sensitivity and whether there is a valid touch based at least in part on the processing step Means for determining whether or not.

  In some embodiments, the processor-readable non-transitory medium causes the processor to scan the touch panel with a first frame that includes at least one touch panel blob that results from a touch on the touch panel, and the touch on the touch panel. Scan the touch panel with a second frame that includes at least one touch panel blob resulting from processing the touch panel blob in the first frame based at least in part on the first touch reporting sensitivity and second touch Read by a processor configured to cause the touch panel blob in the second frame to be processed based at least in part on the reported sensitivity and to determine if there is a valid touch based at least in part on the processing step. Contains possible instructions.

  Aspects of the present disclosure are shown by way of example. In the accompanying drawings, like reference numbers indicate like elements.

FIG. 3 is a simplified block diagram of a portable device that may incorporate one or more embodiments. FIG. 6 illustrates various one-hand touch gestures and corresponding touch primitives according to some embodiments. FIG. 6 illustrates various gestures and corresponding touch primitives including pen touch according to some embodiments. FIG. 6 illustrates a gesture including a pen touch on a touch panel and corresponding touch primitives according to some embodiments. FIG. 2 is a block diagram of an adaptive touch signal processing architecture according to some embodiments. FIG. 6 illustrates touch primitives (or touch blobs) in multiple frames captured by a touch interface. 7 is a table 600 illustrating an adaptation scheme for handling different types of touches. 5 is a flow diagram illustrating a method for adaptive touch processing that depends on the size of a touch. 5 is a flow diagram illustrating an exemplary method for recognizing touch input for a touch panel. FIG. 11 illustrates an example computing system in which one or more embodiments may be implemented. FIG. 2 illustrates an example architecture of a mobile device using a touch screen display and an external display device. FIG. 6 illustrates an example of a mobile touch screen device that uses a touch screen controller. It is a figure which shows the example of the data path | route of the electrostatic capacitance type touch process of a touch screen device. FIG. 2 is a more detailed diagram of a mobile handset architecture display and touch subsystem. It is a flowchart of the method of threshold value determination of a signal. It is a flowchart of the method of threshold value determination of a signal.

  Several exemplary embodiments are described below with reference to the accompanying drawings, which form a part of this specification. Although specific embodiments in which one or more aspects of the disclosure may be implemented are described below, other embodiments may be used without departing from the scope of the disclosure or the spirit of the appended claims There are possibilities that various modifications will be made.

  The detailed description set forth below in connection with the accompanying drawings is intended as a description of various configurations and is not intended to illustrate only the configurations in which the concepts described herein may be implemented. . The detailed description includes specific details that are intended to provide a thorough understanding of various concepts. However, it will be apparent to those skilled in the art that these concepts may be practiced without these specific details. In some instances, well-known structures and components are shown in block diagram form in order to avoid obscuring such concepts.

  Several aspects of touch screen devices are described below with reference to various apparatus and methods. These devices and methods are described in the following detailed description by various blocks, modules, components, circuits, steps, processes, algorithms, etc. (collectively referred to as “elements”) and illustrated in the accompanying drawings. . These elements may be implemented using electronic hardware, computer software, or any combination thereof. Whether such elements are implemented in hardware or software depends on the particular application and design constraints imposed on the overall system.

  By way of example, an element, or any portion of an element, or any combination of elements may be implemented by a “processing system” that includes one or more processors. Examples of processors include microprocessors, microcontrollers, digital signal processors (DSPs), field programmable gate arrays (FPGAs), programmable logic devices (PLDs), state machines, gated logic, discrete hardware circuits, and books It includes other suitable hardware configured to perform the various functions described throughout the disclosure. One or more processors of the processing system may execute software. Software is called instructions, instruction sets, whether called software, firmware, middleware, microcode, hardware description language, or otherwise. , Code, code segment, program code, program, subprogram, software module, application, software application, software package, routine, subroutine, object, executable, thread of execution, procedure, function, etc.

  Thus, in one or more exemplary embodiments, the functions described can be implemented in hardware, software, firmware, or any combination thereof. If implemented in software, the functions may be stored on a computer-readable medium or encoded as one or more instructions or code on a computer-readable medium. Computer-readable media includes computer storage media. A storage media may be any available media that can be accessed by a computer. By way of example, and not limitation, such computer-readable media may be RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage device, or desired program in the form of instructions or data structures. Any other medium that can be used to carry or store the code and that is accessible by the computer can be included. As used herein, a disk and a disc are a compact disc (CD), a laser disc, an optical disc, a digital versatile disc (DVD). versatile disc), and floppy disk, which normally reproduces data magnetically, while the disc uses a laser to optically data Play. Combinations of the above should also be included within the scope of computer-readable media.

  Touch screen technology enables various types of applications. As discussed above, the user may touch the touch screen to perform various operations such as executing an application. In one example, the touch screen provides a direct touch user interface such as a virtual keyboard and user-directed controls. A touch screen user interface may perform proximity detection. The user may write by hand on the touch screen. In another example, touch screen technology may be used for security functions such as surveillance, intrusion detection, and authentication, and used for control of usage environments such as lighting control and appliance control. Also good. In another example, touch screen technology may be used for health care applications (eg, remote sensing environment, prognosis, and diagnosis).

  Several types of touch screen technologies are currently available with different designs, resolutions, sizes, etc. Examples of relatively low resolution touch screen technologies include acoustic pulse recognition (APR), dispersive signal technology (DST), surface acoustic wave (SAW), normal infrared (IR / NIR), Includes waveguide infrared, light, and force sensing. A typical mobile device includes a capacitive touch screen (eg, a mutual projective-capacitance touch screen) that allows for higher resolution and thinner size screens. Furthermore, capacitive touch screens provide high accuracy, good linearity, and good response time, and a relatively low probability of missed detection and false detection. Accordingly, capacitive touch screens are widely used in mobile devices such as mobile phones and tablets. Examples of capacitive touch screens used in mobile devices include in-cell and on-cell touch screens discussed below.

Portable Device Including Capacitive Touch Panel FIG. 1 shows a simplified block diagram of a portable device 100 that may incorporate one or more embodiments. The portable device 100 includes a processor 110, a display 130, an input device 140, a speaker 150, a memory 160, a capacitive touch panel 170, a digital touch interface 180, and a computer readable medium 190.

  The processor 110 may be any general purpose processor operable to execute instructions on the portable device 100. The processor 110 is coupled to other units of the portable device 100 including a display 130, an input device 140, a speaker 150, a capacitive touch panel 170, a digital touch interface 180, and a computer readable medium 190.

  Display 130 may be any device that displays information to the user. Examples may include an LCD screen, a CRT monitor, or a 7 segment display.

  The input device 140 may be any device that accepts input from the user. Examples may include a keyboard, keypad, mouse, or touch input.

  The speaker 150 may be any device that outputs sound to the user. Examples may include a built-in speaker or any other device that generates sound in response to an electrical audio signal.

  The memory 160 may be any magnetic, electronic, or optical memory. Memory 160 includes two memory modules, module 1 162 and module 2 164. It should be understood that the memory 160 may include any number of memory modules. An example of the memory 160 may be dynamic random access memory (DRAM).

  Capacitive touch panel 170 and display 130 may generally extend in the same space and form a user interface for device 100. A user may touch the capacitive touch panel 170 to control the operation of the portable device 100. In some embodiments, the touch may be performed with the user's finger or fingers. In other embodiments, the touch may be performed by other parts of the user's hand or other body parts. In yet other embodiments, the touch may be made by using a stylus that is gripped by the user or otherwise brought into contact with the capacitive touch panel 170. The touch may be made intentionally or unintentionally on a part of the user. In other applications, the capacitive touch panel 170 may be embodied as a touch pad of the portable device 100. In such applications, the display 130 may not spread in the same space as the capacitive touch panel 170 and is close to the user touching the capacitive touch panel 170 to control the computing device. Could be placed on.

  The digital touch interface 180 may include a touch front end (TFE) and / or a touch back end (TBE). This partition is not fixed or fixed, and each block executes and is assigned a front-end or back-end function or considered a front-end or back-end function (one or more) ) May vary depending on high level function. TFE detects the capacitance of capacitive sensors, including capacitive touch panel 170, and delivers a high signal-to-noise ratio (SNR) capacitive image (or heat map) to TBE To work. TBE obtains this capacitive heat map from TFE, distinguishes, classifies, locates and tracks the object (s) that touch capacitive touch panel 170 and processes this information 110 can be returned. TFE and TBE may be partitioned into hardware and software or firmware components as desired, for example, depending on the requirements of any particular design. In one embodiment, the TFE can be implemented largely with hardware components, and some or all of the functionality of the TBE can be implemented with the processor 110.

  The computer readable medium 190 may be any magnetic, electronic, optical, or other computer readable storage medium. The computer readable medium 190 may include one or more software modules that are executable by the processor 110.

Touch Gestures and Touch Primitives FIG. 2A shows various one-handed touch gestures and corresponding touch primitives. Various touch gestures can be performed by the user on the touch panel of a device having a touch interface. For example, various touch gestures can be performed by the user on the capacitive touch panel 170 (FIG. 1). Various one hand touch gestures may include gestures made using the finger 202 or the entire hand 204. Some gestures can be made by simply touching the capacitive touch panel 170 (FIG. 1) with a finger 202 or hand 204. Other gestures may be performed by performing a “swipe” operation with the finger 202 or the hand 204 on the capacitive touch panel 170 (FIG. 1).

  When the finger 202 or hand 204 contacts the capacitive touch panel 170 (FIG. 1), the capacitive touch panel 170 (FIG. 1) may detect touch primitives or touch “blobs” that result from the touch. A touch primitive or “blob” can be thought of as an imprint of a touch on touch panel 170 (FIG. 1). In other words, a touch primitive or “blob” may be a set of signals that represent a sensed touch area of capacitive touch panel 170 (FIG. 1). Touch primitives resulting from a touch can vary depending on the type of touch and the size of the touch. For example, the touch of the finger 202 on the capacitive touch panel 170 (FIG. 1) can result in the first touch primitive 206. Touching the capacitive touch panel 170 (FIG. 1) with the hand 204 can result in a second touch primitive 208. In some embodiments, the first touch primitive 206 may be smaller than the second touch primitive 208 because the touch that results from the finger 202 is smaller than the touch that results from the hand 204.

  It should be understood that the size of the resulting touch of the finger 202 can vary. For example, a typical touch resulting from a finger 202 touch may vary between 7 millimeters (mm) and 14 mm depending on the finger 202 profile. Sometimes, a finger can rest on the capacitive touch panel 170 (FIG. 1), and at other times, the finger 202 can be placed on the capacitive touch panel 170 (FIG. 1) with moderate pressure. The finger 202 may be pressed or the finger 202 may be pressed against the capacitive touch panel 170 (FIG. 1) with low pressure. It should be understood that the size of the touch primitive can vary in each case. It is also understood that these are just a few examples of the types of touches that can be made by the finger 202 and that there can be various other types of touches that result from various other sized touch primitives. Can be done. For example, the size of the first touch primitive 206 may vary depending on the size of the finger 202 and how the finger 202 has made a touch gesture.

  These concepts extend to touch with the hand 204. That is, touching the capacitive touch panel 170 (FIG. 1) with the hand 204 can result in touch primitives of various different sizes depending on the size of the hand 204 and how the hand 204 made the touch gesture. . For example, the size of the second touch primitive 208 can vary depending on the size of the hand 204 and how the hand 204 has made a touch gesture.

  The portable device touch interface (capacitive touch panel) described above is often adjusted or configured to detect a valid touch based on the size of touch primitives between pre-configured sizes. For example, if a portable device is expected to receive touch input by a user's finger 202, it is adjusted or configured to determine that the touch is valid if it has a touch primitive with a size between 7mm and 14mm. There is a possibility. The touch interface may consider all touch primitives outside this range (which are the result of a touch on capacitive touch panel 170 (Figure 1)) as noise and make them invalid or unintended touches There is a possibility to refuse as. Similarly, if a portable device is expected to receive touch input by the user's hand 204, it may be adjusted or configured to determine that the touch is valid when it has a touch primitive greater than 19 mm. . The touch interface considers all touch primitives (which are the result of a touch on capacitive touch panel 170 (Figure 1)) below this value as noise and may reject them as invalid or unintentional touches There is. As a result, portable devices can often mistakenly reject a user's touch of hand 204 because the touch interface is only adjusted or configured to detect a finger 202 touch as a valid touch, Or vice versa.

  Touch interfaces that can dynamically adjust or configure the sensing of various touches with different touch primitive sizes by time multiplexing the sensing and detection of the various touches are described in further detail below.

  FIG. 2B shows various gestures including pen touch and corresponding touch primitives. Various touch gestures can be performed by the user on the touch panel of a device having a touch interface. For example, various touch gestures can be performed by the user on the capacitive touch panel 170 (FIG. 1). Various touch gestures may include gestures made using a pen input tool (eg, stylus 210). Some gestures can be made by simply touching the capacitive touch panel 170 (FIG. 1) with the stylus 210. Other gestures can be performed by performing a drag operation with the stylus 210 on the capacitive touch panel 170 (FIG. 1).

  When the stylus 210 contacts the capacitive touch panel 170 (FIG. 1), the capacitive touch panel 170 (FIG. 1) may detect touch primitives or “blobs” resulting from the touch, as described above. . Touch primitives resulting from a touch can vary depending on the type of touch and the size of the touch. For example, the touch of the stylus 210 on the capacitive touch panel 170 (FIG. 1) may result in the stylus touch primitive 216. During use of the stylus 210, the user may touch a portion of the user's hand to the touch panel, such as when writing or drawing in a natural manner using the stylus 210. For example, the user's palm 212 or finger 214 may be in contact with (touching) the touch panel while the user operates the stylus 210. Touching the capacitive touch panel 170 (FIG. 1) with the user's palm 212 or finger 214 may result in a palm touch primitive 218 and / or finger touch primitive 220, respectively. As mentioned above, each of the touch primitives can be a different size based on various factors.

  It should be understood that the size of the touch that results from the stylus 210 can vary. For example, a typical touch primitive resulting from stylus 210 may be 2 mm or less. The size of the stylus touch primitive 216 that results from the touch of the stylus 210 may vary depending on the angle at which the user holds the stylus when interacting with the touch panel using the stylus. The size of the palm touch primitive 218 and the finger touch primitive 220 may vary depending on how the user places the user's palm 212 or finger 214 on the touch screen device.

  The touch interface of the device described above in connection with FIG. 1 is often adjusted or configured to detect a valid touch based on the size of the touch primitive typical for finger 214. For example, the touch interface may be adjusted or configured to consider touch primitives between 7 mm and 14 mm as valid touches. The touch interface may consider all touch primitives outside this range (which are the result of a touch on capacitive touch panel 170 (Figure 1)) as noise and make them invalid or unintended touches There is a possibility to refuse as. As a result, portable devices can often mistakenly reject a user's touch of stylus 210 because the touch interface is only adjusted or configured to detect a finger 202 touch as a valid touch. That is, since the touch interface is only adjusted to sense and detect touch primitives related to the finger 202 touch, the user may not be able to interact with the touch interface using the stylus 210. Touch primitives resulting from touch of the stylus 210 may be ignored as noise by the touch interface because the size of the touch primitives may be outside the range of the predicted finger touch primitives 220.

  Touch interfaces that can dynamically adjust or configure the sensing of various touches with different touch primitive sizes by time multiplexing the sensing and detection of the various touches are described in further detail below.

  FIG. 3 shows a gesture that includes a pen touch to the touch panel and the corresponding touch primitive. The diagram of FIG. 3 shows the user's hand handling the stylus 210 device and interacting with the capacitive touch panel 170 (FIG. 1). The figure also shows the touch primitive described in connection with FIG. 2B. In the process where the user holds the stylus 210 in the natural description position, the user finger 214, the palm 212, and the stylus 210 may touch the capacitive touch panel 170. As described above, as a result of touching the capacitive touch panel 170, one or more touch primitives may be detected by the touch interface. Touch primitives may include stylus touch primitives 216, palm touch primitives 218, and finger touch primitives 220.

  As described above, the touch interface may be adjusted or configured to detect the size of a particular touch primitive as a valid touch and reject the size of other touch primitives as noise. For example, in FIG. 3, when the touch interface is adjusted or configured to detect touch input from finger 214, touch primitives that result from a touch on capacitive touch panel 170 between 7 mm and 14 mm May be considered a valid touch. All touch primitives outside this range are considered noise and may be rejected as invalid touches. As a result, stylus 210 touches typically result in touch primitives having a size of 2 mm or less, so stylus touch primitives 216 resulting from stylus 210 touches may be rejected as noise by the touch interface. is there. That is, the touch interface adjusted or configured in accordance with the touch of the finger 214 may not be able to accurately detect the touch by the stylus 210.

  In another example, the user may decide to no longer interact with the touch interface using the stylus 210, and instead desires to interact with the touch interface using the user's finger 214. However, when the touch interface is tuned or configured to detect touch input from the stylus 210, only touch primitives resulting from touches on the capacitive touch panel 170 below 2mm can be considered valid touches. There is sex. All touch primitives beyond this range are considered noise and may be rejected as invalid touches. As a result, the finger touch primitive 220 or the palm touch primitive 218 may be rejected as noise by the touch interface because both of these touch primitives exceed 2 mm in size. In other words, a touch interface configured to detect touch input from stylus 210 may not be able to accurately detect a touch with finger 214 or palm 212.

  Touch interfaces that can dynamically adjust or configure the sensing of various touches with different touch primitive sizes by time multiplexing the sensing and detection of the various touches are described in further detail below.

Adaptive Touch Interface FIG. 4 is a block diagram of an adaptive touch signal processing architecture 400 according to some embodiments. Touch signal processing architecture 400 may dynamically adjust or configure the sensing of touches with different touch primitive sizes by time multiplexing the sensing and detection of different touch primitive sizes.

  Touch signal processing architecture 400 includes a kernel 410, a touch library 430, a platform touch screen subsystem 440, and a stylus signaling processor 460.

  Platform touchscreen subsystem 440 includes a real-time raw touch signal interface coupled to touch subsystem control 453 and protocol processing unit 442. Touch subsystem control 453 is coupled to touch activity & status detection unit 443, active noise rejection unit 444, touch reference estimation, and a baselining & adaptation unit 445. Protocol processing unit 442, touch activity & status detection unit 443, and active noise rejection unit 444 are also coupled to a correlated sampling unit 446. Correlation sampling unit 446 is coupled to touch reference estimation, criteria determination and adaptation unit 445. Touch reference estimation, criteria determination and adaptation unit 445 is coupled to analog front end unit 447. The analog front end unit 447 may communicate with the touch screen panel and interface 454 to receive an analog touch signal based on the user's touch on the touch screen and convert the analog touch signal to a digital touch signal to generate the touch signal. May generate data. The analog front end unit 447 may include a row / column driver and an analog to digital converter (ADC).

  The platform touch screen subsystem 440 also includes a battery, a charging circuit, and a power manager unit 450. The battery, charging circuit, and power manager unit 450 may interface with another power subsystem of the portable device that is outside the touch signal processing architecture 400. In some embodiments, the power manager unit 449 may be separate from the battery, charging circuit, and power manager unit 450. The power manager unit 449 may be coupled to the scan engine 448. Scan engine 448 is also coupled to touch subsystem control 453. The platform touch screen subsystem 440 also includes a temperature compensated crystal oscillator (TCXO), a phase locked loop (PLL), and a clock generator component 451. TXCO, PLL, and clock generator component 451 are coupled to clock and timing circuit 452. TXCO, PLL, and clock generator component 451 may communicate with other timing components of the portable device that are outside of touch signal architecture 400.

  The kernel 410 includes a stylus driver 422 that is coupled to an external stylus signaling processor 460. The stylus signaling processor 460 may inform the stylus driver 422 of stylus detection in the vicinity of the portable device. The stylus driver 422 is coupled to the touch interface driver 423. The touch interface driver 423 is also coupled to the real-time raw touch signal protocol processing unit 413. The real-time raw touch signal protocol processing unit 413 is coupled to the real-time raw touch signal interface 441 in the platform touch screen subsystem 440. The touch interface driver 423 receives interrupt requests from the touch driver IRQ handler 411 and the kernel IRQ handler 412. The real-time raw touch signal protocol processing unit 413 may communicate the presence of the user's touch to the kernel IRQ handler 412. The kernel IRQ handler 412 may communicate a trigger signal to the touch driver IRQ handler 411, and in turn, the touch driver IRQ handler 411 may communicate the trigger signal to the touch interface driver 423.

  The real-time raw touch signal protocol processing unit 413 is also coupled to the digital filtering unit 414. Digital filtering unit 414 is coupled to a Gaussian blur-subtraction unit 415. Gaussian blur reduction unit 415 is coupled to blob analysis unit 416. The blob analysis unit 416 is coupled to the false touch rejection unit 417. The false touch rejection unit 417 is coupled to the final touch filtering unit 418. Final touch filtering unit 418 is coupled to detailed touch interpolation unit 419. The detailed touch interpolation unit 419 is coupled to the touch coordinate & size calculation unit 420. The touch coordinate & size calculation unit 420 is coupled to the OS input layer 421. Raw touch signal protocol processing unit 413, digital filtering unit 414, Gaussian blur reduction unit 415, blob analysis unit 416, false touch rejection unit 417, final touch filtering unit 418, detailed touch interpolation unit 419, and touch coordinate & size calculation unit 420 Constitutes a raw touch signal processor.

  The touch library 430 includes a touch library & hardware abstraction layer 431, a touch service library 432, and a touch manager library 433. The touch library & hardware abstraction layer 431 is communicatively coupled to the OS input layer 421.

  Scan engine 448, analog front end unit 447, touch reference estimation, criteria determination & adaptation unit 445, correlation sampling unit 446, false touch rejection unit 417, final touch filtering unit 418, and advanced touch interpolation unit 419 are adaptive for touch signals It should be understood that it is optimized for the correct processing. That is, these components of touch signal processing architecture 400 are designed to detect touches of various different touch types (e.g., stylus, finger, palm, etc.) by time multiplexing one or more frames. Optimized for dynamic adjustment of touch sensitivity. By increasing the touch panel scan rate, the touch signal processing architecture 400 adjusts the touch sensitivity in the first frame to detect the touch that results in the size of the first touch primitive, and the size of the second touch primitive. There is a possibility to adjust the touch sensitivity in the second frame in order to detect the touch that causes the.

  FIG. 5 shows touch primitives (or touch blobs) in multiple frames captured by the touch interface. A specific example shows two frames (frame A510 and frame B520). The captured frame may represent an image of the capacitive touch panel 170 (FIG. 1) that is part of the touch interface. The touch interface can be part of a portable device, for example. Both frame A and frame B show a finger touch primitive 206 and a stylus touch primitive 208. The finger touch primitive 206 may be a result of the user touching the user's finger on the touch panel. The stylus touch primitive 208 may be the result of the user touching the stylus on the touch panel. It should be understood that in this context, a frame may refer to the entire touch panel grid scan.

  It should be understood that the frame shown in FIG. 5 may be captured by scan engine 448 (FIG. 4). As described above, the touch signal processing architecture 400 (FIG. 4) can be dedicated to detecting touch primitives in which the first frame has a first size range and the second frame has a second size. Frame capture may be time multiplexed so that it can be dedicated to detecting touch primitives with ranges. Accordingly, the touch signal processing architecture 400 (FIG. 4) may dynamically adjust itself for the detection of a variety of different touch sizes on the touch panel. For each frame, touch signal processing architecture 400 (FIG. 4) may set or adjust touch reporting sensitivity for touch primitives (or touch blobs). For example, touch signal processing architecture 400 (FIG. 4) may set a first touch reporting sensitivity for touch primitives at frame A510 and a second touch reporting sensitivity for touch primitives at frame B520.

  In one example, the first touch reporting sensitivity may be set or adjusted to detect a stylus touch, eg, a touch having a touch primitive less than 2 mm in diameter. In some embodiments, touch signal processing architecture 400 (FIG. 4) may be able to detect the presence of an active stylus near the touch panel. For example, the active stylus may emit a signal that can be detected by the touch signal processing architecture 400 (FIG. 4) indicating the proximity of the active stylus to the touch panel. In such a case, the one or more frames may be dedicated to detecting a stylus touch based on the proximity of the active stylus to the touch panel. In another example, the second touch reporting sensitivity may be set or adjusted to detect a finger touch, eg, a touch primitive that is greater than 2 mm in diameter and less than 19 mm in diameter. It should be understood that the touch reporting sensitivity for any frame captured by the scan engine can be set or adjusted for any type of touch, and stylus and finger touches are merely examples.

  Other properties of the touch interface may also be changed by the touch signal processing architecture 400 while dynamically adjusting or adapting itself to detect various touch sizes. In some embodiments, the scan rate of the scan engine may be changed based on what type of touch the current captured frame is reserved for detecting. For example, detection of large touches may have a low scan rate, while detection of stylus touches may have a high scan rate. In some embodiments, the range of false touch rejection for touch primitives can be changed based on what type of touch the current captured frame is reserved for detecting. For example, a frame reserved for detecting large touches may have a false touch rejection range of less than 19 mm in diameter. That is, all touch primitives captured in a frame less than 19 mm in diameter can be rejected as noise. In another example, a frame reserved for detecting a stylus touch may have a false touch rejection range of more than 2 mm in diameter. That is, all touch primitives captured in a frame exceeding 2 mm in diameter can be rejected as noise. In yet another example, a frame reserved for detecting finger touches may have a false touch rejection range that is greater than 2 mm in diameter and less than 19 mm. In some embodiments, the final filtering threshold may be changed based on what type of touch the current captured frame is reserved for detecting. For example, a frame reserved for detecting a large touch may have a high final filtering threshold. In another example, a frame reserved to detect a stylus touch may have a low final filtering threshold. In yet another example, a frame reserved for detecting a stylus touch may have an adaptive final filtering threshold. In some embodiments, the type of detail interpolation may be changed based on what type of touch the current captured frame is reserved for detecting. For example, higher order IIR interpolation may be performed on touch primitives in frames reserved to detect large touches. In another example, low order IIR interpolation may be performed on touch primitives in frames reserved to detect stylus touches. In yet another example, motion dependent IIR interpolation may be performed on touch primitives in a frame reserved for detecting finger touches.

  In the exemplary frame shown in FIG. 5, frame A 510 is reserved to detect a stylus touch and frame B 520 is reserved to detect a finger touch. In the frame A510, both the finger touch primitive 206 and the stylus touch primitive 208 exist. Frame A510 may be reserved to detect a stylus touch when touch signal processing architecture 400 (FIG. 4) detects a stylus near the touch panel, as described above. In addition, the touch signal processing architecture 400 (FIG. 4) provides the following schemes for stylus touch detection: high scan rate, high sensitivity, range of false touch rejection over 2 mm in diameter, low threshold final filtering, and Low order IIR detailed interpolation may be adapted. Touch signal processing architecture 400 (FIG. 4) may consider stylus touch primitive 208 as a valid touch and reject finger touch primitive 206 as noise because it is beyond the 2 mm diameter rejection range. there is a possibility. In the frame B520, both the finger touch primitive 206 and the stylus touch primitive 208 exist. Frame B520 may be reserved to detect finger touches. Touch signal processing architecture 400 (Figure 4) uses the following methods for finger touch detection: motion & noise dependent scan rate, size dependent sensitivity, diameter less than 2mm and diameter 19mm Extensive false touch rejection ranges, adaptive final filtering, and motion-dependent detailed interpolation may be adapted.

  As can be seen, both frame A 510 and frame B 520 may be reserved for detecting different types of touches. In some embodiments, two or more consecutive frames may be reserved to detect a particular type of touch. For example, frames 1 and 5 may be reserved for detecting finger touches, and frames 2-4 may be reserved for detecting stylus touches. In some embodiments, a greater number of frames may be reserved to detect touches (eg, stylus touches) that result in smaller touch primitives. As shown by the above example, both the stylus and the user's finger may be touching the touch interface touch panel. However, touch signal processing architecture 400 (FIG. 4) may time multiplex the detection of various touches by reserving frames for the detection of a particular type of touch using the method described above. As a result, the touch signal processing architecture 400 (FIG. 4) can detect and process touches from various different types of touches as valid touches, and the user can use these various different types of touches. Can interact with portable devices. It should be appreciated that in some embodiments, frame reservation may not be necessary for finger touches (described below).

  FIG. 6 is a table 600 illustrating an adaptation scheme for handling different types of touches. More particularly, the table 600 is based on three different touch types 610: a large touch 612 (e.g., palm touch), a stylus touch 614, and a finger touch 616 (see FIG. The adaptation method implemented by 4) is shown. Each of the different touch types 610 may have different touch primitive features 620 that are specific to the touch type 610. Touch signal processing architecture 400 (FIG. 4) may select different adaptation schemes for each of the different touch types 610. In addition, the touch signal processing architecture 400 (FIG. 4) may change the selection mechanism 630 based on the touch type 610. For example, the selection mechanism 630 can be modified to select a touch greater than 19 mm in diameter for a large touch 612. In another example, the selection mechanism 630 may be modified for stylus touch 614 touch type 610 to detect a stylus in the vicinity of the touch panel and to detect the status of the stylus on the touch panel. In yet another example, the selection mechanism 630 may remain in the default mode or be changed to the default mode due to the touch type 610 of the finger touch 616.

  The specific adaptation method selected includes the following attributes: frame reservation 640, scan rate 650, capacitive touch mode 660, touch sensitivity 670, false touch rejection range 680, final filtering mode 690, and advanced interpolation Selection of mode 695 may be included. It should be understood that the adaptation scheme may also include additional attributes not shown or described in FIG.

  For touch type 610 of large touch 612 (eg, palm touch), touch signal processing architecture 400 may modify selection mechanism 630 to select all touch primitives having a diameter greater than 19 mm. In addition, the touch signal processing architecture 400 (FIG. 4) has the following adaptation schemes for the touch type 610 of the large touch 612: frame reservation, low scan rate, projected-capacitance, minimum May implement sensitivity, range of false touch rejection for touch primitives less than 19 in diameter, high threshold final filtering, and high order IIR detailed interpolation.

  Because of the touch type 610 of the stylus touch 614, the touch signal processing architecture 400 may detect the proximity of the stylus to the touch panel and modify the selection mechanism 630 to detect the stylus that has touched the touch panel. In addition, touch signal processing architecture 400 (Figure 4) has the following adaptation schemes for touch type 610 of stylus touch 614: frame reservation, high scan rate, projected capacitance, high sensitivity, 2mm diameter May implement false touch rejection range for touch primitives above, low threshold final filtering, and low order IIR detailed interpolation.

  Due to the touch type 610 of the finger touch 616, the touch signal processing architecture 400 may keep or change the selection mechanism 630 to a predetermined predetermined amount. The touch signal processing architecture 400 (Figure 4) also has the following adaptation schemes for the touch type 610 of the finger touch 616: no frame reservation, motion & noise dependent scan rate, projected capacitance May implement variable size sensitivity, range of false touch rejection for touch primitives less than 2mm in diameter and greater than 19mm in diameter, adaptive final filtering, and motion-dependent IIR detailed interpolation.

  FIG. 7 is a flow diagram illustrating a method 700 for adaptive touch processing that depends on the size of the touch. Method 700 may be performed by touch signal processing architecture 400 (FIG. 4). At block 702, a wake-up request is sent to the host device as a result of detecting a touch on the touch panel. The host device may reside on a portable device. At block 704, the scan mode for the touch interface is changed to a projected capacitive scan mode.

  At block 705, a determination is made as to whether the touch primitive size of the detected touch is small. If it is determined that the size of the touch primitive is small, a request is made to the scan manager to allocate (reserve) a frame for the small touch size and the touch sensitivity is set high (block 706). At block 708, small touch primitives resulting from small touches (eg, with a stylus) are processed and decoded. The method then continues to block 710 (described below).

  If it is determined that the size of the touch primitive is not small, the method continues at block 709. At block 709, a determination is made as to whether the touch primitive size of the detected touch is large. If it is determined that the size of the touch primitive is large, a request is made to the scan manager to allocate (reserve) a frame for the large touch size and the touch sensitivity is set to a minimum (block 710). At block 712, large touch primitives resulting from a large touch (eg, due to a user's palm) are processed and decoded. If it is determined that the size of the touch primitive is not large, the method continues at block 716.

  At block 714, the palm region from the touch panel is excluded. That is, touch primitives resulting from the user's palm touch are excluded from further processing and / or decoding. At block 716, a determination is made whether there are any valid touches. The touch can be a nominal touch (eg, a finger touch) that is not considered a small (stylus) touch or a large (palm) touch. If a determination is made that there is no valid touch, the touch interface enters a standby mode and waits for a touch (block 717). If a determination is made that a valid touch exists, a request is made to the scan manager to allow a frame for the nominal (eg, finger touch) touch size (block 718). At block 720, the nominal touch primitive that results from the nominal touch is processed and decoded. The method then returns to block 705.

  FIG. 8 is a flow diagram illustrating an example method 800 for recognizing touch input for a touch panel. At block 810, the touch panel is scanned across the first frame and the second frame, and the first frame and the second frame include touch panel blobs that result from a touch on the touch panel. For example, the touch panel may be part of the capacitive touch panel of the portable device of FIG. A touch can occur as a result of a user's touch with, for example, a user's finger, a user's palm, or a stylus device. The scan can be performed by a scan engine.

  At block 820, a first touch reporting sensitivity is set for the first frame and a second touch reporting sensitivity is set for the second frame. The first and second touch reporting sensitivities can be different. The first touch reporting sensitivity may be set to detect the first type of touch and the second touch reporting sensitivity may be set to detect the second type of touch There is sex. The scan rate of the touch panel may be adjusted. The first touch reporting sensitivity may include a false touch rejection size less than 19 mm in diameter. The second touch reporting sensitivity may include a false touch rejection size greater than 2 mm in diameter.

  At block 830, the touch panel blob in the first frame is processed based at least in part on the first touch reporting sensitivity, and the touch panel blob in the second frame is at least partially in the second touch reporting sensitivity. Processed based on The first and second frames may be processed by adapting the false touch rejection range, adjusting the final filtering type, adjusting the detailed interpolation type, and determining the coordinates of the touch.

  At block 840, a determination is made whether there is a valid touch based at least in part on the processing step. The position of the touch blob relative to the touch panel may be determined based at least in part on the processing step.

  In some embodiments, the method may continue by scanning the touch panel with a third frame that includes a touch panel blob that results from a touch on the touch panel. A third reporting sensitivity may be set for the third frame. The touch panel blob in the third frame may be processed based at least in part on the third touch reporting sensitivity. A determination can be made whether there is a valid touch based at least in part on the processing step. In some embodiments, the third touch reporting sensitivity includes setting a false touch rejection size that is less than 2 mm in diameter and greater than 19 mm in diameter.

Exemplary Computing System FIG. 9 illustrates an example computing system in which one or more embodiments may be implemented. The computer system shown in FIG. 9 can be incorporated as part of the input recognition device described above. For example, the computer system 900 represents some of the components of a television, computing device, server, desktop, workstation, automobile control or interaction system, tablet, netbook, or any other suitable computing system. be able to. The computing device may be any imaging device having an image capture device or input sensitive unit and a user output device. The image capturing device or the input sensing unit may be a camera device. The user output device may be a display unit. Examples of computing devices include, but are not limited to, video game consoles, tablets, smartphones, and any other handheld device. FIG. 9 may perform the methods provided by various other embodiments described herein, and / or a host computer system, remote kiosk / terminal, point-of-sale device, car phone or FIG. 6 provides a schematic diagram of an embodiment of a computer system 900 that can function as a navigation or multimedia interface, computing device, set-top box, table computer, and / or computer system. FIG. 9 is intended only to provide a generalized view of the various components, and any or all of these various components may be utilized as needed. Accordingly, FIG. 9 broadly illustrates how the elements of an individual system can be implemented in a relatively separate or relatively more integrated manner. In some embodiments, the computer system 900 can be used to implement the functionality of the capacitive touch panel of FIG.

  A computer system 900 is shown that includes hardware elements that can be electrically coupled (or otherwise communicated as needed) via a bus 902. The hardware elements include one or more general-purpose processors and / or one or more processors 904 including, without limitation, one or more dedicated processors (such as a digital signal processing chip, a graphics acceleration processor, etc.) Embodiments of the invention and one or more input devices 908 that may include without limitation one or more cameras, sensors, mice, keyboards, microphones configured to detect ultrasound or other sounds, etc. And one or more output devices 910 that may include, without limitation, a display unit such as a device used in a printer, a printer, and the like.

  In some implementations of embodiments of the present invention, various input devices 908 and output devices 910 may be incorporated into interfaces such as display devices, tables, floors, walls, and window screens. Further, input device 908 and output device 910 coupled to the processor may form a multidimensional tracking system.

  The computer system 900 may include, without limitation, local and / or network accessible storage and / or disk drives, drive arrays, optical storage devices, random access memory (“RAM”) and / or programming. One or more non-transitory storage devices 906 that may include, without limitation, solid state storage devices such as read-only memory (`` ROM '') that may be possible, flash updateable, etc. And / or communicate with such non-transitory storage device 906). Such a storage device may be configured to implement any suitable data storage, including without limitation various file systems, database structures, and the like.

  The computer system 900 includes a modem, a (wireless or wired) network card, an infrared communication device, a wireless communication device (such as a Bluetooth device, an 802.11 device, a WiFi device, a WiMax device, a cellular communication facility) and / or a chipset. May also include a communication subsystem 912 that may include without limitation. Communication subsystem 912 may allow data to be exchanged with a network, other computer systems, and / or any other device described herein. In many embodiments, the computer system 900 further includes a non-transitory working memory 918 that may include a RAM or ROM device, as described above.

  The computer system 900 may include an operating system 914, device drivers, executable libraries, and / or computer programs provided by various embodiments and / or by other embodiments described herein. What is currently located in working memory 918, including other code such as one or more application programs 916 that may be designed to implement the methods provided and / or configure the system May also include software elements shown as. By way of example only, one or more of the procedures described in connection with the method (s) discussed above may include code executable by a computer (and / or a processor within the computer) and / or In which case, such code and / or instructions may be implemented as a general purpose computer (or other device) to perform one or more operations in accordance with the described methods. ) May be used to configure and / or adapt.

  A set of these instructions and / or code may be stored on a computer-readable storage medium, such as the storage device (s) 906 described above. In some cases, a storage medium may be incorporated within a computer system such as computer system 900. In other embodiments, the storage medium is separate from the computer system (eg, a removable medium such as a compact disk) and / or the storage medium is programmed with instructions / code stored on the storage medium. May be provided in an installation package so that it can be used to configure, configure, and / or adapt. These instructions may take the form of executable code that is executable by computer system 900 and / or (eg, any of various widely available compilers, installation programs, compression / decompression utilities, etc. May be in the form of source and / or installable code in the form of executable code when compiled and / or installed on computer system 900.

  Major changes can be made according to specific requirements. For example, customized hardware may be used and / or certain elements may be implemented in hardware, software (including portable software such as applets), or both. In addition, connections to other computing devices such as network input / output devices may be used. In some embodiments, one or more elements of computer system 900 may be omitted or implemented separately from the illustrated system. For example, the processor 904 and / or other elements may be implemented separately from the input device 908. In one embodiment, the processor is configured to receive images from one or more cameras implemented separately. In some embodiments, elements other than those shown in FIG. 9 may be included in computer system 900.

  Some embodiments may use a computer system (such as computer system 900) to perform the method according to the present disclosure. For example, some or all of the described method steps may include one or more processors 904 included in working memory 918 (which may be incorporated into other code such as operating system 914 and / or application program 916) It may be executed by computer system 900 in response to executing one or more sequences of instructions. Such instructions may be read into working memory 918 from another computer readable medium, such as one or more of storage device (s) 906. By way of example only, execution of a sequence of instructions contained in working memory 918 may cause processor (s) 904 to perform one or more steps of the methods described herein.

  As used herein, the terms “machine-readable medium” and “computer-readable medium” refer to any medium that participates in providing data that causes a machine to operation in a specific fashion. In some embodiments implemented using computer system 900, various computer-readable media may be involved in providing instructions / code to processor (s) 904 for execution. And / or may be used to store and / or carry such instructions / code (eg, as a signal). In many implementations, a computer-readable medium is a physical and / or tangible storage medium. Such a medium may take many forms, including but not limited to, non-volatile media, volatile media, and transmission media. Non-volatile media includes, for example, optical and / or magnetic disks, such as storage device (s) 906. Volatile media includes, without limitation, dynamic memory, such as working memory 918. Transmission media includes coaxial cables, including wire including bus 902, copper wire, and optical fiber, and various components of communication subsystem 912 (and / or media on which communication subsystem 912 provides communication with other devices) ) Without limitation. Thus, the transmission medium can take the form of waves (including, without limitation, radio waves, sound waves, and / or light waves such as radio waves, sound waves, and / or light waves generated during radio wave and infrared data communications). There is also sex.

  Common forms of physical and / or tangible computer readable media are, for example, floppy disks, flexible disks, hard disks, magnetic tapes, or any other magnetic medium, CD-ROM, any other optical media. Media, punch card, paper tape, any other physical media using hole patterns, RAM, PROM, EPROM, FLASH-EPROM, any other memory chip or cartridge, carrier wave as described below, or computer command And / or any other medium that can read the code.

  Various forms of computer readable media may be involved in carrying one or more sequences of one or more instructions to processor (s) 904 for execution. By way of example only, instructions may initially be carried on a remote computer's magnetic disk and / or optical disk. The remote computer may load the instructions into the dynamic memory of the remote computer and send the instructions as a signal over a transmission medium for reception and / or execution by the computer system 900. These signals, which may be in the form of electromagnetic signals, acoustic signals, optical signals, etc., are all examples of carriers on which instructions may be encoded, according to various embodiments of the invention.

  Generally, the communication subsystem 912 (and / or a component of the communication subsystem 912) receives the signal and the bus 902 sends the signal (and / or data carried by the signal, instructions, etc.) to the working memory 918. From the working memory 918, the processor (s) 904 retrieves and executes the instructions. The instructions received by working memory 918 may optionally be stored on non-transitory storage device 906 either before or after execution by processor (s) 904.

Further Embodiments FIG. 10 is a diagram illustrating an example of a mobile device architecture 1200 using a touch screen display and an external display device. In this example, the mobile device architecture 1200 is coupled to an application processor 1202, a cache 1204, an external memory 1206, a general purpose graphics processing unit (GPGPU) 1208, an application data mover 1210, an application data mover 1210, and a GPGPU 1208. On-chip memory 1212 and multispectral multiview imaging core, correction / optimization / enhancement, multimedia processors and accelerators coupled to on-chip memory 1212 component) 1214. Application processor 1202 communicates with cache 1204, external memory 1206, GPGPU 1208, on-chip memory 1212, and multispectral multiview imaging core modification / optimization / enhancement multimedia processor and accelerator component 1214. Mobile device architecture 1200 includes a display / touch panel having an audio codec, microphone, headphone / earphone and speaker component 1216, a display processor and controller component 1218, and a driver and controller coupled to display processor and controller component 1218. And further includes a component 1220. Mobile architecture 1200 may optionally include an external interface bridge (eg, docking station) 1222 coupled to a display processor and controller component 1218 and an external display 1224 coupled to external interface bridge 1222. The external display 1224 may be coupled to the external interface bridge 1222 via a wireless display connection 1226 or a wireless display connection 1226 such as a high definition multimedia interface (HDMI) connection or a wired connection. Mobile device architecture 1200 further includes a connectivity processor 1228 coupled to 3G / 4G modem 1230, Wi-Fi modem 1232, satellite positioning system (SPS) sensor 1234, and Bluetooth module 1236. Mobile device architecture 1200 also includes peripheral devices and interfaces 1238 that communicate with external storage module 1240, connection processor 1228, and external memory 1206. The mobile device architecture also includes a security component 1242. External memory 1206 is coupled to GPGPU 1208, application data mover 1210, display processor and controller 1218, audio codec, microphone, headphone / earphone and speaker component 1216, connection processor 1228, peripheral device and interface 1238, and security component 1242. The

  Mobile device architecture 1200 is a battery monitor and platform resource / power coupled to battery charging circuit and power manager components and temperature compensated crystal oscillator (TCXO), phase locked loop (PLL), and clock generator component 1246 A manager component 1244 is further included. Battery monitor and platform resource / power manager component 1244 is also coupled to application processor 1202. Mobile device architecture 1200 further includes a sensor and user interface device component 1248 coupled to application processor 1202 and includes a light emitter 1250 and an image sensor 1252 coupled to application processor 1202. The image sensor 1252 is also coupled to a multispectral multiview imaging core modification / optimization / enhancement multimedia processor and accelerator component 1214.

  FIG. 11 is a diagram illustrating an example of a mobile touch screen device 1300 having a touch screen controller. Mobile touch screen device 1300 includes a touch screen display unit 1302 coupled to a multi-core application processor subsystem 1306 with a high level output specification (HLOS) and a touch screen subsystem 1304 using a stand-alone touch screen controller. . The touch screen display unit 1302 includes a touch screen panel and interface unit 1308, a display driver and panel unit 1310, and a display interface 1312. The display interface 1312 is coupled to a display driver and panel 1310 and a multi-core application processor subsystem 1306 by HLOS. The touch screen panel and interface unit 1308 receives a touch input by a user's touch, and the display driver and panel unit 1310 displays an image. The touch screen subsystem 1304 includes an analog front end 1314, a touch activity and status detection unit 1316, an interrupt generator 1318, a touch processor and decoder unit 1320, a clock and timing circuit 1322, and a host interface 1324. The analog front end 1314 can communicate with the touch screen panel and interface 1308 to receive an analog touch signal based on the user's touch on the touch screen and convert the analog touch signal to a digital touch signal to generate raw touch signal data There is sex. The analog front end 1314 may include a row / column driver and an analog to digital converter (ADC).

  The touch activity and status detection unit 1316 receives the touch signal from the analog front end 1314 and then detects the presence of the user's touch on the interrupt generator 1318 so that the interrupt generator 1318 communicates the trigger signal to the touch processor and decoder unit 1320. introduce. When the touch processor and decoder unit 1320 receives the trigger signal from the interrupt generator 1318, it receives the touch signal raw data from the analog front end 1314 and processes the touch signal raw data to generate touch data. The touch processor and decoder 1320 transmits touch data to the host interface 1324, and the host interface 1324 transfers the touch data to the multi-core application processor subsystem 1306. Touch processor and decoder 1320 is also coupled to a clock and timing circuit 1322 that communicates with analog front end 1314.

  In some embodiments, the processing of raw touch signal data is handled by subsystem 1306 rather than unit 1320. In some such embodiments, control 1304 or one or more components of control 1304, eg, unit 1320, may be omitted. In other such embodiments, the controller 1304 and / or all components of the controller 1304 are included, but the touch signal raw data is passed to the subsystem 1306 without processing or with reduced processing. In some embodiments, processing of the touch signal raw data is distributed between unit 1320 and subsystem 1306.

  Mobile touch screen device 1300 also includes a display processor and controller unit 1326 that transmits information to display interface 1312 and is coupled to multi-core application processor subsystem 1306. Mobile touch screen device 1300 further includes on-chip and external memory 1328, application data mover 1330, multimedia and graphics processing unit (GPU) 1332 and other sensor system 1334, which are multi-core application processors. Coupled to subsystem 1306. On-chip and external memory 1328 is coupled to a display processor and controller unit 1326 and an application data mover 1330. Application data mover 1330 is also coupled to a multimedia and graphics processing unit 1332.

FIG. 12 shows an example of a capacitive touch processing data path for the touch screen device 1400. The touch screen device 1400 has a touch scan control unit 1402 coupled to a power management integrated circuit (PMIC) and a drive control circuit 1404 that receives drive signals from a touch sensitive drive power supply unit 1406. Drive control circuit 1404 is coupled to the top electrode 1408. The capacitive touch screen includes two sets of electrodes, the first set includes a top electrode 1408 (or exciter / driver electrode), and the second set includes a bottom An electrode 1410 (or sensor electrode) is included. The top electrode 1408 is coupled to the bottom electrode 1410 by the capacitance between the top electrode 1408 and the bottom electrode 1410. The capacitance between the top electrode 1408 and the bottom electrode 1410 includes electrode capacitance (celectrode) 1412, mutual capacitance (cmutual) 1414, and touch capacitance (ctouch) 1416. Including. User touch capacitance (CTOUCH) 1418 may be formed when there is a user touch to the top electrode 1408 of the touch screen. When there is a user touch on the top electrode 1408, the user touch capacitance 1418 induces the capacitance of the top electrode 1408, thus creating a new discharge path for the top electrode 1408 by the user touch. For example, before the user's finger touches the top electrode 1408, the available charge on the top electrode 1408 is passed through the bottom electrode 1410. The user's touch on the touch screen creates a discharge path due to the user's touch, and thus changes the charge discharge rate of the touch screen by introducing user touch capacitance 1418. The user touch capacitance 1418 generated by the user touch is the capacitance between the top electrode 1408 and the bottom electrode 1410 (e.g., electrode capacitance 1412, mutual capacitance 1414, and touch capacitance). Capacity 1416), and thus other capacitances between the top electrode 1408 and the bottom electrode 1410 (e.g., celectro
may replace de1412, cmutual1414, and ctouch1416).

  The bottom electrode 1410 is coupled to the charge control circuit 1420. The charge control circuit 1420 controls the touch signal received from the uppermost electrode 1408 and the lowermost electrode 1410 and transmits the controlled signal to the touch conversion unit 1422. The touch conversion unit 1422 quantizes the controlled signal. Convert to a signal suitable for The touch conversion unit 1422 transmits the converted signal to the touch quantization unit 1424 for quantization of the converted signal. Touch conversion unit 1422 and touch quantization unit 1424 are also coupled to touch scan control unit 1402. Touch quantization unit 1424 transmits the quantized signal to filtering / noise removal unit 1426. After filtering / denoising the quantized signal in filtering / denoising unit 1426, filtering / denoising unit 1426 transmits the resulting signal to sense compensation unit 1428 and touch processor and decoder unit 1430. The sensing compensation unit 1428 performs sensing compensation using the signal from the filtering / noise removal unit 1426 and provides the sensing compensation signal to the charge control circuit 1420. In other words, the sensing compensation unit 1428 is used by the charge control circuit 1420 to adjust the sensitivity of touch sensing at the top electrode 1408 and the bottom electrode 1410.

  Touch processor and decoder unit 1430 communicates with clock and timing circuit 1438, which communicates with touch screen control unit 1402. Touch processor and decoder unit 1430 receives the resulting signal from filtering / denoising unit 1426, touch reference estimation, criteria determination and adaptation unit 1432; touch event detection and segmentation unit 1434; touch coordinates and size calculation Unit 1436 is included. Touch reference estimation, criteria determination and adaptation unit 1432 is coupled to touch event detection and segmentation unit 1434, and touch event detection and segmentation unit 1434 is coupled to touch coordinate and size calculation unit 1436. Touch processor and decoder unit 1430 also communicates with HLOS small coprocessor / multicore application processor 1440, HLOS small coprocessor / multicore application processor 1440 includes touch primitive detection unit 1442, touch primitive tracking unit 1444, symbol ID And a gesture recognition unit 1446. Touch primitive detection unit 1442 receives signals from touch coordinate and size calculation unit 1436 and performs touch primitive detection, and then touch primitive tracking unit 1444 coupled to touch primitive detection unit 1442 tracks touch primitives. Execute. A symbol ID and gesture recognition unit 1446 coupled to the touch primitive tracking unit 1444 performs symbol ID and / or gesture recognition.

  Various touch sensing technologies are used in touch screen technology. Touch capacitance sensing technology includes electric field sensing, charge transfer, pressure sensitive resistor, relaxation oscillator, capacitance-to-digital conversion (CDC), dual ramp, sigma delta Modulation and successive approximation using a single slope ADC may be included. Touch capacitive sensing technology used in today's projected capacitive (P-CAP) touch screen controllers includes frequency-based touch capacitance measurement, time-based touch capacitance measurement, and voltage-based touch. Includes capacitance measurement.

  In frequency based measurements, a touch capacitor is used to generate an RC oscillator, from which time constant, frequency, and / or period are measured. Frequency-based measurements include a first method using a relaxation oscillator, a second method using frequency modulation, and a third method using a synchronous demodulator. The first method using a relaxation oscillator uses a sensor capacitor as the oscillator timing element. In a second method using frequency modulation, a capacitive sensing module uses a constant current source / sink to control the oscillator frequency. The third method, using a synchronous demodulator, excites the capacitance with a sine wave source and measures the capacitor's current and voltage with the four-wire ratiometric of the synchronous demodulator coupled to the capacitor. To measure the AC impedance of the capacitor.

  Time-based measurements measure charge / discharge that is time dependent on touch capacitance. Time-based measurements include methods using resistive capacitor charge timing, charge transfer, and capacitor charge timing using a successive approximation register (SAR). The method using resistance capacitor charging timing measures the charging / discharging time of the sensor capacitor with respect to a constant voltage. In methods using charge transfer, charging the sensor capacitor and integrating the charge over several cycles, comparing to an ADC, or a reference voltage determines the charging time. Many charge transfer techniques are similar to sigma delta ADCs. In the method using capacitor charging timing using SAR, changing the current through the sensor capacitor corresponds to a reference ramp.

  Voltage based measurements monitor the magnitude of the voltage to sense the user's touch. The voltage based measurement includes a charging time measuring unit, a charging voltage measuring unit, and a method using a capacity voltage divide. The method using the charging time measurement unit charges the touch capacitor with a constant current source and measures the time to reach the voltage threshold. The method using a charging voltage measuring unit charges a capacitor from a constant current source for a known time and measures the voltage of the capacitor. The method using the charging voltage measurement unit requires very little current, a highly accurate current source, and a high impedance input to measure the voltage. The method using capacitive voltage division uses a charge amplifier that converts the ratio of the sensor capacitor to the reference capacitor into a voltage (Capacitive-Voltage-Divide). The method using capacitive partial pressure is the most common method for interfacing with precision low capacitance sensors.

  FIG. 13 shows a more detailed view of the display and touch subsystem of the mobile handset architecture. The mobile handset 1500 includes a touch screen display unit 1502, a touch screen controller 1504, and a multi-core application processor subsystem 1506 by HLOS. Touch screen display unit 1502 includes a touch panel module (TPM) unit 1508 coupled to touch screen controller 1504, a display driver 1510, and a display panel 1512 coupled to display driver 1510. The mobile handset 1500 also includes a system memory 1514, a user application and 2D / 3D graphics / graphic effects (GFX) engine unit 1516 coupled to the system memory 1514, and a multimedia video, camera / vision engine / processor unit 1518. And a downstream display scaler 1520. User application and 2D / 3D GFX engine unit 1516 communicates with display overlay / synthesizer 1522, which in turn communicates with display video analysis unit 1524. Display video analysis unit 1524 communicates with display dependent optimization and refresh control unit 1526, and display dependent optimization and refresh control unit 1526 communicates with display controller and interface unit 1528. Display controller and interface unit 1528 communicates with display driver 1510. Multimedia video, camera / vision engine / processor unit 1518 communicates with frame rate upconverter (FRU), deinterlace, scaling / rotation component 1530, frame rate upconverter (FRU), deinterlace, scaling / rotation configuration Element 1530 communicates with display overlay / synthesizer 1522. Downstream display scaler 1520 communicates with downstream display overlay / synthesizer 1532, and downstream display overlay / synthesizer 1532 communicates with downstream display processor / encoder unit 1534. Downstream display processor / encoder unit 1534 communicates with wired / wireless display interface 1536. Multi-core application processor subsystem 1506 by HLOS, display video analysis unit 1524, display dependent optimization and refresh control unit 1526, display controller and interface unit 1528, FRU, deinterlace, scaling / rotation component 1530, downstream display overlay / It communicates with a synthesizer 1532, a downstream display processor / encoder unit 1534, and a wired / wireless display interface 1536. The mobile handset 1500 also includes a battery management system (BMS) and PMIC unit 1538 coupled with a display driver 1510, a touch screen controller 1504, and a multi-core application processor subsystem 1506 by HLOS.

  There is a known problem for accurate sensing of touch on a touch screen. For example, the touch capacitance may be small depending on the touch medium. Touch capacitance is sensed with high output impedance. In addition, touch transducers often operate on platforms with large parasitic and noisy environments. In addition, touch transducers can be distorted by offsets, and the dynamic range of touch transducers can be limited by DC bias.

  Several factors can affect the signal quality of the touch screen. On touch screen panels, signal quality, touch sensing type, resolution, touch sensor size, fill factor, touch panel module integration configuration (e.g., out-cell, on-cell, in-cell, etc.) and scan May be affected by the overhead. The type of touch media, such as the hand / finger or stylus, and the size of the touch, as well as responsiveness such as touch sensing efficiency and transconductance gain, can affect signal quality. In addition, sensitivity, linearity, dynamic range, and saturation level can affect signal quality. In addition, no-touch signal noise (e.g. thermal and board noise), fixed pattern noise (e.g. touch panel spatial non-uniformity), and temporal noise (e.g. EMI / RFI, power supply noise, display noise) Noise, noise in use, noise in use environment) can affect signal quality.

  One commonly used technique to optimize the signal-to-noise ratio (SNR) of touch signals is to minimize stray capacitance, avoid conductive overlay that extends beyond the sensor panel, sensor size and To increase the robustness of the design by maximizing proximity to adjacent sensors, minimizing overlay thickness, and minimizing TPM stacking voids. Another technique that is often used to optimize the SNR of touch signals is reference determination. The reference determination approach takes into account TPM stack specifications, usage environment characteristics, platform context, and touch transducer and converter performance. TPM stack specifications include out-cell / on-cell / in-cell & display type, touch screen controller (TSC) location (printed circuit board (PCB), flex, board, or glass), overlay non-uniformity , Information about voids, and adhesives. Features of the usage environment include pollutants, temperature, humidity, and ambient light. The platform context includes battery charge state / voltage state (SOC / SOV) and device dynamics (eg, accelerometer, gyroscope). The state of charge may indicate how the battery is charging and may be used to estimate when the battery can reach a “full” state. The voltage status may indicate the capacity of the battery (eg, how much charge / battery the battery has) and may depend on the battery type. Touch transducer and converter performance includes sensitivity, saturation level, dynamic range, and linearity.

  For at least the reasons discussed above, an effective approach is desired, for example, to achieve accurate touch sensing on a touch screen to compensate for noise that may be introduced to the touch sensor or display. For example, estimating signal threshold levels to reject unwanted noise and false touches can be beneficial in extracting valid touches. In a noisy situation, threshold determination is difficult and often leads to erroneous touches.

  Embodiments herein including a robust and adaptive method for signaling threshold decisions are introduced here. These methods can be adapted to the signal level of each frame of touch data. Furthermore, the signal threshold can be determined reliably in noisy situations. Such a determination may be realized with fewer computational steps than known methods, for example, robust against noise when other touch processing systems on smartphones are rendered useless there is a possibility. Such embodiments and / or threshold determinations and / or any other embodiments herein may include, for example, elements 1202, 1220, 1218, 1304, 1306, 1320, 1324 shown in FIGS. 1326, 1402, 1422, 1424, 1426, 1428, 1430, 1432, 1434, 1440, 1442, 1444, 1446, 1504, and / or 1506, and / or one or more of one or more components Can be performed by multiple.

  FIG. 14 is a flowchart of a signal threshold determination method. The operations shown in FIG. 14 are the same as the elements 1202, 1220, 1218, 1304, 1306, 1320, 1324, 1326, 1402, 1422, 1424, 1426, 1428, 1430, 1432, 1434 shown in FIGS. , 1440, 1442, 1444, 1446, 1504, and / or 1506, and / or one or more of one or more components, or any combination thereof.

  The minimum and maximum touch frames are determined from an image such as a noise baselined image (step 1610). The maximum-minimum is then calculated (step 1620). Thereafter, one or more blob locations and / or number of blob locations are determined (step 1630). In some embodiments, a connected components algorithm is used. In some embodiments, the connected component algorithm finds or determines regions of connected elements (eg, pixels of the image) that have the same or similar values.

  Further, the peak location (X, Y) and associated value (V) can be determined for each blob (step 1640). In addition, values (V1, V2 ... VN) may be extracted and aligned, for example as (VS_1, VS_2, ... VS_N) (step 1650). With this alignment, the difference between successive samples, for example (VS_1-VS_2, ..... VS_N-1-VS_N) can be determined, and the peak and associated V can be determined There is sex (step 1660). V may be set as a signal threshold for determining whether a touch has occurred.

  FIG. 15 is a flowchart of a method for determining a threshold value of a signal. The operations shown in FIG. 15 are the same as the elements 1202, 1220, 1218, 1304, 1306, 1320, 1324, 1326, 1402, 1422, 1424, 1426, 1428, 1430, 1432, 1434 shown in FIGS. , 1440, 1442, 1444, 1446, 1504, and / or 1506, and / or one or more of one or more components, or any combination thereof.

  The minimum and maximum touch frames are determined from an image, such as a noise reference determined image (step 1710). The maximum-minimum is then calculated (step 1720). Thereafter, one or more blob locations and / or the number of blob locations is determined (step 1730). In some embodiments, a connected component algorithm is used. In some embodiments, the connected component algorithm finds or determines regions of connected elements (eg, pixels of the image) that have the same or similar values.

  In addition, the location and value of each blob's peak can be determined (step 1740). The signal threshold may be initialized or otherwise set to the peak value and may be decremented while the number of blobs with values exceeding the threshold is monitored and / or calculated (Step 1750). If the number of blobs increases, the threshold may be the previous threshold (step 1760). Thus, the signal threshold can be set based on these operations.

  The methods, systems, and devices discussed above are examples. Various embodiments may omit, replace, or add various procedures or components as needed. For example, in alternative configurations, the methods described above may be performed in a different order than that described, and / or various steps may be added, omitted, and / or Or they may be combined. Also, the features described in connection with a particular embodiment may be combined in various other embodiments. Different aspects and elements of the embodiments may be combined in a similar manner. Also, technology has evolved, and thus many of the elements are examples, and these examples do not limit the scope of the present disclosure to those specific examples.

  Specific details are given in the description to provide a thorough understanding of the embodiments. However, embodiments may be practiced without these specific details. For example, well-known circuits, processes, algorithms, structures, and techniques have been shown without unnecessary detail in order to avoid obscuring the embodiments. This description merely provides exemplary embodiments and is not intended to limit the scope, applicability, or configuration of the invention. Rather, the foregoing description of the embodiments provides those skilled in the art with an enabling description for implementing embodiments of the invention. Various changes may be made in the function and configuration of the elements without departing from the spirit and scope of the disclosure.

  Also, some embodiments are described as processes shown as flow diagrams or block diagrams. Each may represent the operations as a continuous process, but many of the operations may be performed in parallel or concurrently. In addition, the order of operations can be rearranged. The process may have additional steps not included in the figure. Further, method embodiments may be implemented by hardware, software, firmware, middleware, microcode, hardware description language, or any combination thereof. When implemented in software, firmware, middleware, or microcode, program code or code segments for performing related tasks may be stored on a computer-readable medium, such as a storage medium. The processor may perform related tasks. Thus, in the above description, the functions or methods described as being performed by a computer system may be performed by a processor configured to perform the functions or methods--eg, processor 110-. Further, such functions or methods may be performed by a processor executing instructions stored on one or more computer readable media.

  While several embodiments have been described, various modifications, alternative constructions, and equivalents may be used without departing from the spirit of the present disclosure. For example, the above elements may only be components of a larger system, and other rules take precedence over or otherwise modify the application of the present invention. there is a possibility. Also, some steps may be started before, during, or after the above factors are considered. Accordingly, the above description does not limit the scope of the disclosure.

  Various examples have been described. These and other examples are within the scope of the appended claims.

100 portable devices
110 processor
130 display
140 input devices
150 speakers
160 memory
170 Capacitive touch panel
180 digital touch interface
190 Computer-readable media
202 fingers
204 hands
206 Touch Primitive
208 touch primitives
210 Stylus
212 palm
214 fingers
216 Stylus Touch Primitive
218 Palm Touch Primitive
220 finger touch primitive
400 touch signal processing architecture
410 kernel
411 Touch driver IRQ handler
412 Kernel IRQ handler
413 Real-time raw touch signal protocol processing unit
414 Digital filtering unit
415 Gaussian blur reduction unit
416 Blob analysis unit
417 false touch rejection unit
418 Final touch filtering unit
419 Detailed Touch Interpolation Unit
420 Touch coordinate & size calculation unit
421 OS input layer
422 Stylus driver
423 touch interface driver
430 touch library
431 Touch Library & Hardware Abstraction Layer
432 Touch Service Library
433 Touch Manager Library
440 platform touchscreen subsystem
441 Real-time raw touch signal interface
442 Protocol processing unit
443 Touch Activity & Status Detection Unit
444 Active noise rejection unit
445 Touch reference estimation and standard determination & calibration unit
446 correlation sampling unit
447 Analog front end unit
448 scan engine
449 Power Manager Unit
450 Battery, charging circuit, and power manager unit
451 Temperature Compensated Crystal Oscillator (TCXO), Phase Locked Loop (PLL), and Clock Generator Components
452 Clock and Timing Circuit
453 Touch subsystem control
454 touch screen panel and interface
460 Stylus signaling processor
510 Frame A
520 Frame B
600 tables
610 Touch types
612 big touch
614 Touching the stylus
616 finger touch
620 Touch Primitive Features
630 Selection mechanism
640 frame reservation
650 scan rate
660 Capacitive touch mode
670 touch sensitivity
680 Range of false touch rejection
690 Final filtering mode
695 Detailed interpolation mode
700 methods
800 methods
900 computer system
902 bus
904 processor
906 Non-temporary storage device
908 input device
910 output device
912 Communication subsystem
914 operating system
916 application programs
918 Non-temporary working memory
1200 mobile device architecture
1202 Application processor
1204 cache
1206 External memory
1208 General-purpose graphics processing unit (GPGPU)
1210 Application data mover
1212 On-chip memory
1214 Multispectral Multiview Imaging Core Modification / Optimization / Enhancement Multimedia Processor and Accelerator Components
1216 audio codec, microphone, headphone / earphone, and speaker components
1218 Display processor and controller components
1220 Display / touch panel components with driver and controller
1222 External interface bridge
1224 External display
1226 Wireless display connection
1228 connected processor
1230 3G / 4G modem
1232 Wi-Fi modem
1234 Satellite Positioning System (SPS) sensor
1236 Bluetooth module
1238 Peripheral devices and interfaces
1240 External storage module
1242 Security components
1244 Battery Monitor and Platform Resource / Power Manager Components
1246 Temperature Compensated Crystal Oscillator (TCXO), Phase Locked Loop (PLL), and Clock Generator Components
1248 Sensor and user interface device components
1250 light emitter
1252 Image sensor
1300 mobile touchscreen device
1302 Touch screen display unit
1304 Touch Screen Subsystem with Standalone Touch Screen Controller
1306 Multi-core application processor subsystem with high-level output specification (HLOS)
1308 Touch screen panel and interface unit
1310 Display driver and panel unit
1312 Display interface
1314 Analog front end
1316 Touch activity and status detection unit
1318 Interrupt generator
1320 Touch processor and decoder unit
1322 Clock and Timing Circuit
1324 Host interface
1326 Display processor and controller unit
1328 On-chip and external memory
1330 Application data mover
1332 Multimedia and Graphics Processing Unit (GPU)
1334 Other sensor systems
1400 touch screen device
1402 Touch scan control unit
1404 Drive control circuit
1406 Power management integrated circuit (PMIC) and touch sensitive drive power supply unit
1408 Top electrode
1410 Bottom electrode
1412 Electrode capacitance (celectrode)
1414 Mutual capacitance (cmutual)
1416 Touch capacitance (ctouch)
1418 User touch capacitance (CTOUCH)
1420 Charge control circuit
1422 Touch conversion unit
1424 Touch quantization unit
1426 Filtering / Noise reduction unit
1428 Sensing compensation unit
1430 Touch processor and decoder unit
1432 Touch reference estimation, standard determination, and calibration unit
1434 Touch event detection and segmentation unit
1436 Touch coordinate and size calculation unit
1438 Clock and timing circuits
1440 HLOS small coprocessor / multicore application processor
1442 Touch Primitive Detection Unit
1444 Touch Primitive Tracking Unit
1446 Symbol ID and gesture recognition unit
1500 mobile handset
1502 Touch screen display unit
1504 touch screen controller
1506 Multi-core application processor subsystem with HLOS
1508 Touch Panel Module (TPM) unit
1510 Display driver
1512 display panel
1514 System memory
1516 User Application and 2D / 3D Graphics / Graphic Effects (GFX) Engine Unit
1518 Multimedia video, camera / vision engine / processor unit
1520 downstream display scaler
1522 Display overlay / synthesizer
1524 Display image analysis unit
1526 Display dependent optimization and refresh control unit
1528 Display controller and interface unit
1530 Frame rate upconverter (FRU), deinterlace, scaling / rotation components
1532 downstream display overlay / synthesizer
1534 Downstream display processor / encoder unit
1536 wired / wireless display interface
1538 Battery Management System (BMS) and PMIC unit

Claims (15)

A method for recognizing touch input for a touch panel,
In the first scan rate, the steps of scanning the touch panel in a first frame including a first touch panel blob resulting from the first touch on the touch panel,
In the second scan rate, the steps of scanning the touch panel in the second frame including a second touch panel blob resulting from the second touch on the touch panel,
Process the first touch panel blob in the first frame based at least in part on a range of diameters of a first touch reporting sensitivity and a first false touch rejection, a second touch reporting sensitivity and a second Processing the second touch panel blob in the second frame based at least in part on a false touch rejection diameter range of the first false touch rejection diameter range, Unlike the range of false touch rejection diameters of 2, the first scan rate is based on the first touch reporting sensitivity and the second scan rate is based on the second touch reporting sensitivity; and
Determining whether there is a valid touch resulting from either the first touch panel blob or the second touch panel blob based at least in part on the processing step. A step of scanning the touch panel in the third frame including at least one touch panel blob resulting from the touch on the touch panel,
Processing the touch panel blob in the third frame based at least in part on a diameter range of a third touch reporting sensitivity and a third false touch rejection;
The method of claim 1, further comprising: determining whether a valid touch exists based at least in part on the processing step.   The method of claim 2, wherein at least one of the first false touch rejection diameter range or the second false touch rejection diameter range is less than 2 millimeters in diameter and greater than 19 millimeters in diameter. .   The method of claim 1, further comprising determining a position of the touch panel blob relative to the touch panel based at least in part on the processing step.   The method of claim 1, wherein the processing further comprises adjusting a scan rate of the touch panel.   The method of claim 1, wherein the processing further comprises filtering and interpolating the touch panel blob.   2. The method of claim 1, wherein at least one of the first false touch rejection diameter range or the second false touch rejection diameter range is less than 19 millimeters in diameter.   2. The method of claim 1, wherein at least one of the first false touch rejection diameter range or the second false touch rejection diameter range is greater than 2 millimeters in diameter. A device for recognizing touch input for a touch panel,
In the first scan rate, and means for scanning said touch panel in a first frame including a first touch panel blob resulting from the first touch on the touch panel,
In the second scan rate, and means for scanning said touch panel in a second frame including a second touch panel blob resulting from the second touch on the touch panel,
Process the first touch panel blob in the first frame based at least in part on a range of diameters of a first touch reporting sensitivity and a first false touch rejection, a second touch reporting sensitivity and a second Means for processing the second touch panel blob in the second frame based at least in part on a range of false touch rejection diameters , wherein the first false touch rejection diameter range is Means different from the second false touch rejection diameter range, wherein the first scan rate is based on the first touch reporting sensitivity and the second scan rate is based on the second touch reporting sensitivity; and ,
Means for determining whether there is a valid touch resulting from either the first touch panel blob or the second touch panel blob based at least in part on the output of the means for processing; Including the device. Means for scanning said touch panel in the third frame including at least one touch panel blob resulting from the touch on the touch panel,
Means for processing the touch panel blob in the third frame based at least in part on a diameter range of a third touch reporting sensitivity and a third false touch rejection;
Means for determining whether there is a valid touch based at least in part on the processing step;
At least one of the diameter range of the first false touch rejection or the diameter range of the second false touch rejection is less than 2 millimeters in diameter and greater than 19 millimeters in diameter,
The apparatus according to claim 9.   11. The apparatus of claim 10, further comprising means for determining a position of the touch panel blob relative to the touch panel based at least in part on the means for processing.   The apparatus according to claim 10, wherein the processing further includes adjusting a scan rate of the touch panel.   11. The apparatus of claim 10, wherein at least one of the first false touch rejection diameter range or the second false touch rejection diameter range is less than 19 millimeters in diameter.   11. The apparatus of claim 10, wherein at least one of the first false touch rejection diameter range or the second false touch rejection diameter range is greater than 2 millimeters in diameter.   A processor-readable non-transitory storage medium comprising processor-readable instructions configured to cause a processor to perform the method of any one of claims 1-8.

Images